/*
    FreeRTOS V6.0.4 - Copyright (C) 2010 Real Time Engineers Ltd.

    ***************************************************************************
    *                                                                         *
    * If you are:                                                             *
    *                                                                         *
    *    + New to FreeRTOS,                                                   *
    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *
    *    + Looking for basic training,                                        *
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    *                                                                         *
    * then take a look at the FreeRTOS eBook                                  *
    *                                                                         *
    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
    *                  http://www.FreeRTOS.org/Documentation                  *
    *                                                                         *
    * A pdf reference manual is also available.  Both are usually delivered   *
    * to your inbox within 20 minutes to two hours when purchased between 8am *
    * and 8pm GMT (although please allow up to 24 hours in case of            *
    * exceptional circumstances).  Thank you for your support!                *
    *                                                                         *
    ***************************************************************************

    This file is part of the FreeRTOS distribution.

    FreeRTOS is free software; you can redistribute it and/or modify it under
    the terms of the GNU General Public License (version 2) as published by the
    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
    ***NOTE*** The exception to the GPL is included to allow you to distribute
    a combined work that includes FreeRTOS without being obliged to provide the
    source code for proprietary components outside of the FreeRTOS kernel.
    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
    more details. You should have received a copy of the GNU General Public 
    License and the FreeRTOS license exception along with FreeRTOS; if not it 
    can be viewed here: http://www.freertos.org/a00114.html and also obtained 
    by writing to Richard Barry, contact details for whom are available on the
    FreeRTOS WEB site.

    1 tab == 4 spaces!

    http://www.FreeRTOS.org - Documentation, latest information, license and
    contact details.

    http://www.SafeRTOS.com - A version that is certified for use in safety
    critical systems.

    http://www.OpenRTOS.com - Commercial support, development, porting,
    licensing and training services.
*/

/*
    Implements a simplistic WEB server.  Every time a connection is made and
    data is received a dynamic page that shows the current TCP/IP statistics
    is generated and returned.  The connection is then closed.

    This file was adapted from a FreeRTOS lwIP slip demo supplied by a third
    party.
*/

/* ------------------------ System includes ------------------------------- */


/* ------------------------ FreeRTOS includes ----------------------------- */
#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"

/* ------------------------ lwIP includes --------------------------------- */
#include "lwip/api.h"
#include "lwip/tcpip.h"
#include "lwip/ip.h"
#include "lwip/memp.h"
#include "lwip/stats.h"
#include "netif/loopif.h"

/* ------------------------ Project includes ------------------------------ */
#include "common.h"
#include <string.h>

#include "HTTPDemo.h"

/* ------------------------ Defines --------------------------------------- */
/* The size of the buffer in which the dynamic WEB page is created. */
#define webMAX_PAGE_SIZE        ( 1024 ) /*FSL: buffer containing array*/

/* Standard GET response. */
#define webHTTP_OK  "HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n"

/* The port on which we listen. */
#define webHTTP_PORT            ( 80 )

/* Delay on close error. */
#define webSHORT_DELAY          ( 10 )

/* Format of the dynamic page that is returned on each connection. */
#define webHTML_START \
"<html>\
<head>\
</head>\
<BODY onLoad=\"window.setTimeout(&quot;location.href='index.html'&quot;,1000)\"bgcolor=\"#CCCCff\">\
\r\n\r\nPage Hits = "

#define webHTML_END \
"\r\n" \
"</pre>\r\n" \
"</BODY>\r\n" \
"</html>"

#if INCLUDE_uxTaskGetStackHighWaterMark
	static volatile unsigned portBASE_TYPE uxHighWaterMark_web = 0;
#endif

/* ------------------------ Prototypes ------------------------------------ */
static void     vProcessConnection( struct netconn *pxNetCon );

/*------------------------------------------------------------------------------*/
/*                            GLOBALS                                          */
/*------------------------------------------------------------------------------*/
static struct netif ENET_if;

/*
 * Process an incoming connection on port 80.
 *
 * This simply checks to see if the incoming data contains a GET request, and
 * if so sends back a single dynamically created page.  The connection is then
 * closed.  A more complete implementation could create a task for each
 * connection.
 */
static void vProcessConnection( struct netconn *pxNetCon )
{
    static portCHAR cDynamicPage[webMAX_PAGE_SIZE], cPageHits[11];
    struct netbuf  *pxRxBuffer;
    portCHAR       *pcRxString;
    unsigned portSHORT usLength;
    static unsigned portLONG ulPageHits = 0;

    /* We expect to immediately get data. */
    pxRxBuffer = netconn_recv( pxNetCon );

    if( pxRxBuffer != NULL )
    {
        /* Where is the data? */
        netbuf_data( pxRxBuffer, ( void * )&pcRxString, &usLength );

        /* Is this a GET?  We don't handle anything else. */
        if( !strncmp( pcRxString, "GET", 3 ) )
        {
            pcRxString = cDynamicPage;

            /* Update the hit count. */
            ulPageHits++;
            sprintf( cPageHits, "%d", (int)ulPageHits );

            /* Write out the HTTP OK header. */            
            netconn_write( pxNetCon, webHTTP_OK, ( u16_t ) strlen( webHTTP_OK ), NETCONN_COPY );

            /* Generate the dynamic page...
            
               ... First the page header. */
            strcpy( cDynamicPage, webHTML_START );
            /* ... Then the hit count... */
            strcat( cDynamicPage, cPageHits );
            
            strcat( cDynamicPage,
                    "<p><pre>Task          State  Priority  Stack      #<br>************************************************<br>" );
            /* ... Then the list of tasks and their status... */
            vTaskList( ( signed portCHAR * )cDynamicPage + strlen( cDynamicPage ) );            
            
            /* ... Finally the page footer. */
            strcat( cDynamicPage, webHTML_END );

            /* Write out the dynamically generated page. */
            netconn_write( pxNetCon, cDynamicPage, ( u16_t ) strlen( cDynamicPage ), NETCONN_COPY );
        }
        netbuf_delete( pxRxBuffer );
    }
    netconn_close( pxNetCon );
}

/*------------------------------------------------------------*/

void vlwIPInit( void )
{
    /* Initialize lwIP and its interface layer. */
    tcpip_init( NULL, NULL );
}

/*------------------------------------------------------------*/

void vBasicWEBServer( void *pvParameters )
{
    struct netconn *pxHTTPListener, *pxNewConnection;
    struct ip_addr  xIpAddr, xNetMast, xGateway;
    extern err_t ethernetif_init( struct netif *netif );

    /* Parameters are not used - suppress compiler error. */
    ( void )pvParameters;

	vlwIPInit();

    /* Create and configure the FEC interface. */
    IP4_ADDR( &xIpAddr, configIP_ADDR0, configIP_ADDR1, configIP_ADDR2, configIP_ADDR3 );
    IP4_ADDR( &xNetMast, configNET_MASK0, configNET_MASK1, configNET_MASK2, configNET_MASK3 );
    IP4_ADDR( &xGateway, configGW_ADDR0, configGW_ADDR1, configGW_ADDR2, configGW_ADDR3 );
    netif_add( &ENET_if, &xIpAddr, &xNetMast, &xGateway, NULL, ethernetif_init, tcpip_input );

    /* make it the default interface */
    netif_set_default( &ENET_if );

    /* bring it up */
    netif_set_up( &ENET_if );

    /* Create a new tcp connection handle */
    pxHTTPListener = netconn_new( NETCONN_TCP );
    netconn_bind( pxHTTPListener, NULL, webHTTP_PORT );
    netconn_listen( pxHTTPListener );

    /* Loop forever */
    for( ;; )
    {	
        /* Wait for connection. */
        pxNewConnection = netconn_accept( pxHTTPListener );

        if( pxNewConnection != NULL )
        {
            /* Service connection. */
            vProcessConnection( pxNewConnection );
            while( netconn_delete( pxNewConnection ) != ERR_OK )
            {
                vTaskDelay( webSHORT_DELAY );
            }
        }
    }
}
